Hi there,

I have some trouble understanding how to derive that the inverse function of the following function

$\displaystyle f(x,y) = (x+y,x-y)$

is

$\displaystyle f^{-1}(x,y) = \frac{1}{2}(x+y,x-y)$

So far I had no trouble in one dimension. Maybe my problem lies here somewhere...

Thanks in advance for any help.

Cheers

Bud